Malicious PDF — malware analysis report

Static analysis result for SHA-256 728f2399745faa07…

MALICIOUS

PDF

39.3 KB Created: 2020-11-07 02:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 40a67e5ab08c89789d25cd6eab9036da SHA-1: e2f4155214566e014273a9def576947cac58ddbc SHA-256: 728f2399745faa07400fff07c0ebe6a452650223d7869858c11d17a9ac10c3ee
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI and a high-severity heuristic firing for a redirector link, indicating a phishing lure. The document body, though partially garbled, contains text related to 'Parts for bowflex treadclimber tc5000' and the malicious URL, suggesting a pretext for the user to click the link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?keyword=parts+for+bowflex+treadclimber+tc5000 PDF link annotation
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/xokoxivibawirodotek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5f9aaab2b4225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5fa5cdffab1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b3596a-e177-499d-ab0f-795450e9b98c/hunter_irrigation_controller_proc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449a128f-e779-440d-909a-515b4300e048/526558410.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://xewavevu.files.wordpress.com/2020/11/55102498877.pdfIn PDF document text
    • https://virinumit.files.wordpress.com/2020/11/kelebihan_dan_kekurangan_pupuk_urea.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/lopajelelezuziwej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C2 5732 bytes
SHA-256: a249e966fb70ab681555a60f6b0760ea25a30eb0d05ed0b058e8aebe8e4c9b9c
font_01_sfnt_off00006550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6550 13116 bytes
SHA-256: 2945511f6e432ca4dabdf9989018d1f6706557c4d0a48fca1ecb7740015d0398